IPhone 4s does not boot and seems not to charge

My iPhone 4S has been charging for 20 hours now (with red bar in the battery on the display), but it will not boot. Also pressing home+hold for 10 seconds (while connected to power) or more does not make it boot.
I have the impression that something is wrong with the part that measures the battery level, since (when it still worked) I sometimes had battery levels dropping to 1% very early after charging, but with the phone still working for over 10 hours after that (so the actual battery charge was much higher than displayed). This problem disappeared and reappeared every now and then. Until now however, I was always able to reboot my phone after a bit of charging - but this seems no longer possible. Recommendations are welcome....

However i can't check settings because the display does not respond, i tried to use three fingers, but nothing happens. It can receive phone calls and notifications, but the display still is not responding so i can't answer phone calls. But now the Led is off.

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